Weil-McLain CGi Series 3 Installation And Maintenance Manual page 60

CG i
GAS-FIRED wATER BOILER- sERIEs a -
Boiler Manual
llc
Troubleshooting - control module lights
(cont.)
CHART 7 - lnsuff1 c1 ent heat or no heat to system (POWER light on steady)
I& WARNINGI
Electrical shock hazard - Wherever you see & TURN OFF POWER&, follow the instructions. Failure to follow
instructions could resuk in severe personal injury, death, or substantial property damage.
.
Has
~
been at least 5 minutes since setting thermostat to
-
call for heat? If not, wait 5 minutes. Is system heating?
.
Is thermostat set to call for heat? Remove thermostat
wires at boiler and check continuity across the two wires.
If circu~ isn1 closed, check external thermostat (zone
valve, relay, etc.) wiring. Correct problems and retry.
.
Reconnect external thermostat wiring at boiler.
Is thermostat circuit dosed (continuity across wires) ?
No
I I
Yes
I--
•
IAre all red lights off?
.
Boiler is in standby .
0
es
_?:
Set thermostat to call for
heat and rech eck
wan
JU
seconas. operation.
Are all red lights off? Verify Sequence of
NO
I
Yes
operation, Figure 30,
•
page38.
Replace control module. l
Retest.
.
If you have sufficient heat boiler should be in normal
operating sequence. (See normal sequence of operation,
~
Figure 30, page 39.)
.
.
.
.
.
60
If you have less than sufficient heat -
Is vent oioina free of blockaae?
No I I Yes
Correct conditions and
Is manifold pressure:
recheck operation.
See Figure 30, page 38
for normal sequence of
operation.
Check heat loss calculation
versus boiler size.
...
Clock gas inp ut .
3.50" w.c. on natural gas?
10.0" w.c. on propane?
Yes
II
No
I .
r
Replace timer relay .
(CGi-4 Only)
Replace temperature
sensor.
Retest.
Is boiler System circulator operating?
No
I
Yes
+
.
Remove CIRCULATOR harness plug from
CIRCULATOR plug receptacle (Figure 38, trem
7, page 53). C heck w~ voltmeter across pins of
control module receptacle.
Does voltmeter show 120 VAC across pins?
No
I
Yes
t ~
.
Replace control
.
Repairtreplace
module. circulator. Retest.
.
Retest.
.
Repairtreplace
wiring . Retest.
.
Wa ~ 5 minutes .
Is FLAME light on?
Yes
I
No
L
Is LIMIT light on?
No
I
Yes
+
.
Check temperature
.
Replace control module .
sensor for correct
.
Retest.
resistance.
Are resistance values
correct?
II
Check rollout switch
No
Yes
continuity - is switch
closed?
Yes
• Replace rollout
sw~ch.
If rollout thermal fuse element has
open ed, determine cause and
correct condition. Failure to do so
will cause severe personal injury,
death or substantial property
damage.
Check any other
limit controls wired
into the limit
circuit If all are
OK, then replace
control module.
Retest.
Part Number
550-142-780/0712